Combined typewriting and computing machine



H. L. PITMAN.

COMBINED TYPEWRITING AND COMPUTING MACHINE.

APPLICATION FILED JAN. 4. I917.

1,362,180. Patented Dec. 14, 1920.

fln j zfii M M y W MW UNITED STATES PATENT OFFICE.

HENRY L. PITMAN, OF EAST ORANGE, NEXV JERSEY, ASS-IGNOR TO UNDERWOOD COM- EUTING llIACI-IINE COMPANY, OF NEV] YORK. N. Y., A GORPORATION OF NEW YORK.

COMBINED TYPEWRITING AND COMPUTING MACHINE.

/ Application filed January 4, 1917.

T all whom it may concern:

Be it known that I, HENRY L. PITMAN, a citizen of the United States, residing in East Orange, in the county of Essex and State of New Jersey, have invented certainnew and useful Improvements in Combined Typewriting and Computing Machines, of which the following is a specification.

This invention relates to totalizers of typewriter computing machines, and more particularly to means for detaching the totalizers, especially where the master wheel is mounted upon the main frame of the machine, and the totalizers are mounted upon the carriage.

The typewriter carriage is usually formed with a longitudinal bar for supporting the totalizers, and this bar is provided with a longitudinal slot or channel, in which fits a clamping key, whereby the totalizer is clamped to the bar.

According to my improvements, the totalizer may be provided with guide tongues, one upon each side, which fit in said slot or channel, whereby the same is held against canting, and theclamping key may have a head which extends above and below, to fit in upper and lower interior grooves formed in said channel, so that the clamping key may operate to hold the totalizer to its seat upon the carriage bar; the clamping key having, for this purpose, a stem which is mounted in the totalizer, and a clamping spring. The carriage bar is provided with upper and lower rows of beveled notches, each extending along the bar, and the totalizer has upper and lower beveled projections to seat in said notches, so that said clamping spring and key (the latter being mounted about midway of the height of the totalizer) may draw the totalizer firmly to its upper and lower seats, the beveling of the seats serving to bring the totalizer accurately to position, by reason of the action of the clamping spring in drawing the totalizer thereagainst.

The clamping spring may be forced back, and the totalizer released from the clamp ing action thereof, by means of a fingerpiece or keys to permit the ready adjustment of the totalizer along the carriage bar,

Specification of Letters Patent.

Patented Dec. 14, 1920.

Serial No. 140,490.

or the withdrawal of the totalizer from the machine by moving said totalizer along the bar until clear therefrom, the clamping key coming out from the end of the grooved channel.

The typist while grasping the totalizer by the thumb and middle finger may opcrate the finger-key by the forefinger. This may not only force the finger-key against the tension of its spring to release the totalizer, but may also positively effect the movement of the totalizer forwardly from the carr l. e bar, to release said totalizer from its seat thereon and permit the ready sliding of the totalizer along the bar by the thumb and forefinger. Upon releasing the finger-key from pressure, the clamping spring again accurately draws the totalizer to its seats upon the bar, and there holds it 7 O firmly. Thus by simple and inexpensive devices, which are not liable to get out of oreer, provision is made for the ready adjustment and accurate positioning of the totalizer, and for security from vibration and accideutal displacement when in use.

Another feature is the normal locking of the clamping mechanism, so that the tension of the clamping spring cannot be overcome nor he totalizzer pulled forwardly from the bar. without first effecting the release thereof. by said finger-key. To this end, a part connected to said finger-key normally locks the clamping key in its effective position with respect to said totalizer, and the de pression of said finger-key both effects the unlocking, to permit relative movement be tween the totalicer and the clamping key, and also forces the clamping spring to release the totalizer from the carriage bar. Thus the totalizer, although it is clamped by a yieldable spring, is positively locked against displacement by a forward pull thereon. The locking device is preferably in the form of a three-armed lever, pivoted upon the totalizer between a finger-key and the clamping key; one arm engaging the clamping key to control the release thereof, another arm being used for locking, and the third arm being used for enabling the fingerkey to unlock and release the totalizer from the carriage bar; a single spring being prefi erably connected to operate both the fingerkey and the three-armed lever for returning the finger-key to normal position and also causing said three-armed lever to clamp the totalizer to the carriage bar.

Other features and advantages will hereinafter appear.

In the accompanying drawings,--

Figure 1 is an end view in. elevation, partly in section, to show the underlying structure. It shows the totalizer in its secured position upon the carriage.

Fig. 2 is an enlarged view, similar to Fig. 1, except that the totalizer is shown as being disengaged from its supporting bar on the carriage, so as to permit it to be adj usted to a difierent letter-space position, or actually removed.

Fig. 3 is a vertical section, taken at right angles to Fig. 2, and shows details or the key-actuated locking and releasing means.

Fig. 1 is a view in elevation of the totalizer detached, looking at it from the rear, showing .the various parts whereby it is properly adjusted and attached to the car riage.

Fig. 5 is a detailed perspective view, showing the totalizer as attached to its supporting bar, in its locked position, with the front part of the totalizer removed, to show the relation of the various locking and attaching parts to each other.

Referring more particularly to the separate parts or" the invention, 1 indicates the main typewriter frame, which is provided on each side with a bracket 2, forming a support for a rail 3, extending between them. This rail 3 is provided with parallel diagonal rollers l and 5, at its top and bottom, to form anti-friction means for supporting a traveling bar 6, which hooks over the rollers a and 5 at the top and bottom, so as to prevent any canting movement. In other words, it may be said that the travel- .ing bar 6 is provided with a deep channel 7, having V-grooves 8 and 9 at the top and bottom thereof, which form ways engaging the rollers 4L and 5.

The traveling bar 6 receives its movement from the usual Underwood typewriter carriage (not shown), as it is connected thereto by means of one or more brackets 10. The traveling bar 6 corresponds in length to at least the length of the travel of the carriage and provides a mounting or support for one or more totalizers 11. They can be placed at any point along the length of the bar to bring them into play at any desired points in the travel of the carriage, corresponding to different computing zones. To enable this adjustment of the totalizers, the traveling bar 6 is provided with a pair of racks 12 and 13, the teeth of which are located at letter-space intervals from each other, so as to give letter-space adjustments of the totalizers. 611 the rear side oi each totalizer, there are provided teeth 1% for meshing with the racks 12 and 13. These teeth are shown 'is located at the four corners of the totalizers, so as to give an absolutely rigid mounting for the totalizer when the teeth are in close mesh with the racks 1:2 and 13.

The teeth ll, when in engagement with the racks 12 and 13, only determine the longitudinal position of the totalizer with respect to the traveling bar (3 and the typewriter carriage. Other means are provided for locking the totalizer in any adjusted position on the traveling bar, and for preventing vertical and spreading movements of the totalizer with respect to the traveling bar. This .neans includes a pair of cubical lugs 15, one on each side of the totalizer, to prevent cantin which extend into a channel or groove 16, provid d on the trout lace oi the traveling bar 6 and extending for the length thereoii. These lugs will prevent vertiral and turning movements of the totalizer with respect to the bar (3.

l ixtending into the channel 16, there is also provided a head 17 of a clamp. The upper and lower edges 18 and 19 of the head project respectively into rabbets 20 and 21, cut above and below the open "front sides of tie channel 16. The head 17 has channels 22 engaging the lugs 17 to guide same in a limited amount or back and forth movement. The head, however, cannot leave the channel 16 through the open front side thciioif, but must he slid to the end oi the bar 6 in order to be removed out of the channel 1.5, which is open at its end for this n p se. Secured to the head 17, there is provided a pin 23 which extends into the casing of the totalizer 11. The head 17 and the pin 2 "form a clamp to bind the totalizer to the bar 6.

."nljustably connected to the pin 23, as by means of an arm 24-, extending into a slot 25, there is provided a shifting and looking double bell crank 26. The bell crank is mounted to oscillate by means of a shaft 27 secured to the totalizer, so that it can reciprocate the clamp 17, 23 back and forth, and thus release and enmesh the totalizer with the bar 6. To manipulate the bell. crank 26, there is orovided an actuator :28, shown in the form of a lever, pivoted by means or a stud shaft 29 and provided with a key or finger-piece 30, whereby it may be operated. The actuator is provided with a cam surface 31 which engages two arms 32 and 33 of the double bell hrank 26. Engaging surfaces of the arms 32 and 83 are quadrantly disposed with respect to each other and with respect to the pivotal axis oi the actuator. This enables the arm 32 to abut against the lower end oi the a TtllEI LOI 2S and term a lock, preventnn-g the bell crank 26 from acting back on the actuator, as any thrust which it would have in tending to rock in a releasing direction wouid act radially through the stud shaft 29.

This, then, would prevent the accidental or forcible disengagement of the totalizer 11 from the bar 6 by pulling on the totalizer.

The combined actuator and lock 28 is nor-' mally held in its locking position by means of a spring 34, coiled about the stud shaft 29. The spring 34 holds the lower end of the actuator against the arm 32 and the arm 33 against the cam surface so that there is absolutely no tendency for the parts to have a relative movement until the key 30 is depressed, to cam the arm 33 and rock the bell crank 26 about its pivot, at the same time withdrawing the lower end of the actuator from its obstructing position above the arm 32. Such an action will rock the bell crank 26, forcing in the pin 23, to release the binding of the head 17 of the clamp on the front sides of the rabbets 20 and 21, and then by a further movement force the totalizer 11 away from the bar 6. This disengages the teeth 14 from the racks 12 and 13, permitting the totalizer to be adjusted along the bar 6, and thus along the typewriter carriage to any letter-space position desired, and even permit it to be removed by taking it to the extreme end of the bar, where the channel 16 is open-endedv When pressure on the finger-piece or key 30 is removed, the spring 34: will act to rock both the actuator 28 and the bell crank 26, drawing the totalizer into its secured position on the bar 6 and moving the lower end of the part 28 to its obstructing and locking position above the arm 82. In this position, the totalizer will be securely held against accidental movement and can only be released by a subsequent operation of the key 30.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1. The combination with a rack having teeth thereon, of a totalizer having teeth thereon to intermesh with said rack teeth, spring means for drawing said totalizer into engagement with said rack and positively locking it there with the teeth intermeshed, and a finger-piece for releasing said spring means.

2. The combination with a support, of a totalizer, teeth at the top and bottom of said totalizer, a pair of toothed racks on said support opposite said teeth, and springactuated means on said totalizer adapted to engage said support midway between said racks for drawing said teeth and said totalizer into enmeshed position with said racks, said means adapted to positively lock said teeth enmeshed.

3. The combination with a support having longitudinal racks of wedging teeth formed thereon, at the top and bottom thereof, and a channel midway of said racks, of a totalizer having teeth thereon at the top and bottom engaging said racks, a clamp extending into said channel, and spring means acting between said clamp and said totalizer for drawing said totalizer and the "teeth thereon into rigid engagement with said racks and said support, and causing said clamp to bind, so as to lock said totalizer to said support.

at. The combination with a support, of a totalizer adjustable along said support, a (lamp for drawing said totalizer against said support, a double bell crank for controlling the movements of said clamp, said bell crank having three arms, one engaging said clamp, and a member engaging the other two arms of said clamp to alternately lock and actuate said bell crank, and thus said clamp.

The combination with a support, of a totalizer adjustable along said support, a clamp for drawing said totalizer against said support, a double bell crank for con trolling the movements of said clamp, said bell crank having three arms, one engaging said clamp, a member engaging the other two arms of said clamp to alternately lock and actuate said bell crank, and thus said clamp, and a spring acting to automatically operate said member and said bell crank.

The combination with a support, of a totalizer adjustable along said support, a clamp for drawing said totalizer against said support, a one-way acting combined actuating and locking mechanism for said clamp, and a. spring for actuating said mechanism.

'7. The combination with a support, of a totalizer mounted upon said support, a clamp for drawing said totalizer against said support, and a manually operable Geneva train to said clamp, enabling the release of said totalizer by operating said train, but preventing its release by force ap plied to the totalizer itself. I

8. The combination with a support, of a totalizer mounted upon said support, a clamp for drawing said totalizer to said support, three-armed bell crank, having one arm engaging and actuating said clamp, and a cam lever offering, when passive, a radial obstruction to one of said arms, and operating, when active, to shift the other of sa d arms, so as to effect a relative adjustment between said clamp, said totalizer and said support.

9. The combination with a support having a pair of racks thereon, of a totalizer having teeth at the four corners thereof, and meshable with said racks, said support having a channel intermediate said racks. a pair of lugs at opposite sides of said totalizer extending into said channel, a clamp having a head in slidable but non-rotative engagement with said lugs and extending into said channel, and means lfor effecting a relative movement between said totalizer and said clamp, so as to positively eifect a relative movement back and "forth between said total's aer and the parts arried thereby, and said support and the parts carried thereby.

10. The combination with a bar comprising a longitudinal channel, of a totaiizer adjustably mounted on said bar and including a lu slidable along said channel, a lock of which said lug forms a part adapted to draw said totalizer against the bar, a linger-piece for operating said lock, a cam for making the lock effective and eomprising what is substantially a dwell adapted to positively hold the look when ellective, and a spring normally tending to make said cam effective.

11. The combination with a bar comprising a longitudinal channel, of a totalizer including a lug slidable along said channel, a finger-piece on the totalizer adapted to move said totalizer away from the support by thrusting on said lug, a cam operated by said finger-piece for so operating the lug, and a spring normally moving said cam to position to make the lug effective to draw the totalizer against the support to lock it in place there.

12. The combination with a support and a slide, of a totalizer adapted to be grasped to be moved along the slide, and a lingerpiece adapted to be made efi'ective to cause the totalizer to move outwardly from the support to enable it to be slid.

13. The combination with a support and a slide, of a totalizer adapted to be grasped by the thumb and a finger, and a fingerpiece adapted to be operated by another finger of the hand grasping the totalizer, adapted to be then depressed to cause the totalizer to move outwardly on the slide to enable it to be slid along the support.

14. The combination with a support, of a totalizer adjustable along said support, a clamp adapted to hold the totalizer clear of the support and to permit the totalizer to be shifted along the support while clear or its face, and adapted to draw the totalizer against the support when made effective, a double bell crank for controlling the movements of said clamp, said bell crank having three arms, one engaging said clamp, and a member engaging the other two arms oil.

said clamp to alternately lock and actuate said bell crank, and thus said clamp.

15. The combination with a support, oi a totalizer adjustable along said support, a clamp adapted to hold the totalizer clear of the support and to permit the totalizer to be shifted along the support while clear of its face, ant adapted to draw the totaliaer against the support when made ell'ective, a double bell crank for controlling the movements of said clamp, said bell crank having three arms, one engaging said clamp, a member engaging the other two arms of said clamp to alternately lock and actuate said bell crank, and thus said clamp, and a spring acting to automatically operate said member and said bell crank.

16. The combination with a sumgort, of a totalizer adjustable along said support, a clamp adapted to hold the totalizer clear of the support and to permit the totalizer to be shifted along the support while clear of its face, and adapted to draw the totalizer against the support when made eil'ective, a one-way acting combined actuating and locking mechanism for said clamp, and a spring for actuating said mechanism.

17. The combination with a support, of a totalizer mounted upon said support, a clamp adapted to hold the totalizer clear of the support and to permit the totalizer to be shifted along the support while clear of its face, and adapted to draw the totalizer gainst the support when made e'fiective, and a manually operable Geneva train to said clamp, enabling the release of said totalizer by operating said train, but preventing its release by force applied to the totalizer itself.

18. The combination with a support, of a totalizer mounted upon said support, a clamp adapted to hold the totalizer clear of the support and to permit the totalizer to be shifted along the support while clear of its face, and adapted to draw the totalizer against the support when made eil'ective, a three-armed bell crank, having one arm engaging and actuating said clamp, and a cam lever offering, when passive, a radial obstruction to one of said arms, and operating, when active, to shift the other of said arms, so as to effect a relative adjustment between said clamp, said totalizer and said support.

HENRY L. PITMAN.

lVitnesses ARTHUR A. JoHNsoN, JENNIE P. THORNE. 

